Relay.



H. W. CHENEY.

RELAY.

7 V 7 APPLICATION FILED APR.17, 1911. I 1,149,496. 4 Patented Aug. 10, 1915.

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HERBERT W.,CHENEY, OF MILWAUKEE, WISCONSIN, ASSIGNOR, BY ME SNE ASSIGN- MENTS, TO ALLIS-CHALMERS MANUFACTURING COMP-NY, A CORPORATION OF DELAWARE.

. Spehification of Letters Patent.

RELAY.

Patented Aug. 10, 1915.,

I Application filed April 17 1911. Serial lilo. 621,666.

To all whom it may concern:

Be it known that I, 'HERBERT W. CHENEY, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Relays, of which the following is a full, clear, and exact specification. 1 My invention relates to time-element rea s.

llt is the object of my invention to provide a time-element relay which shall be simple in construction, reliable in operation, and suitable for high voltage work.

To this end my invention comprises certain novel features which will appear from the description and drawings and will be set forth in the appended claims.

Figure 1 is a sectional view of a timeelement' relay embodying my invention, be-

ing taken on the line 1-1 of Fig. 2 and showing diagrammatically one set of connections with which it may be used; and,

. -Fi 2 is a section on the line 2-2 of Fig. 1.

he casing 10, made of some moldedinsulating material, is provided with supporting feet 11, and has a plurality of compartments,

here shown as three in number, separated by walls 13. In each compartment is mounted an overload coil 14, the location of the coils 14 in the different compartments en abling high voltages to be used safely. The ends of each overload coil extend through openings in the top of the casing 10 to terminals 15, which are properly connected, as to current transformers 16, to make the coils 14 responsive to overloads on a circuit or on different phases of a polyphase circuit. The terminals 15 are covered by a second insulating casing 17, which, besides supporting the hinged arm 12,,is provided with partitions 18 to furnish compartments for the difierent sets of terminals 15, and is open at the back to allow'the leads from'the terminals 15 to extend to the current transformers 16. The casing 17 is fastened to the casing 10 bymeans of screws 17*.

The core 19 of each overload coil 14: is preferably made of laminated iron in an inverted U-shape, and is fastened, as by a screw 19, to a. lug 20 projecting forward from the rear of the compartment in which it is mounted. For each overload coil there is an armature 21, pivoted at the rear downward extension of the core 19. The forward ends of the three armatures 21 are mechanlcally joined by means of a metal strip 22. The r'niddle armature 21 has a downward extenslon 23 at the rear, directly in front of which is a downward extension 24 from the strip 22. A screw 25 extends between the downward extensions 23 and 24:, and is prevented from longitudinal movement by collars 26 on the two sides of the extension 23. A spring 27 cooperates with fiat surfaces on one of the collars 26 to lock the screw 25 against accidental turning. The screw 25 carries a threaded weight 28, which is held from turning but may be moved back and forth by the screw 25 to vary the sensitiveness, of the overload'coils. A pointer 29 GX',

tends downward from the weight 28 through a slot in the bottom of the casing 10, and moves over a scale 30.

The screw 25 also has loosely mounted on it a bridging member 31 of a switch, this bridging member when the armatures 21 are in their lowermost positions resting on the upper ends of two contact terminals 32.

Mounted below the bottom of the casing 10 is a thermostat 33, which preferably con sists of two angulanly disposed metal strips" spaced apart and mounted on a common base at one end, and,firmly fastened together at the other end, one of the strips being surrounded by a heating coil 34:. Une end of this heating coil is connected to a switch contact 35, carried or otherwise operated by the thermostat and cooperating with a fixed contact 36 connected to one of the contact terminals 32. The other contact terminal 32 is connected to theother end of the heating coil 3%, so that the heating coil 34 and the switch contacts 35 and 36 are short-circuited when the bridging contact 31 rests upon the two contact terminals 32, The thermostat 33, the scale 30, the switch contacts 35 and 36, and the lower ends of the contact terminals 32 may be covered by a third insulating casing 37. I This casing is held in place by a spring 38 and is easily removable. The three casings 10, 17, and 37 may be considered as diflerent parts of one casing, and in 1 3 1 and the switch-i contacts and 36,

is biased to open position but may be held in closed position by a no-voltage coil 40. The circuit of this no-voltage coil includes the contact terminals 32 and some connection between them. Upon an overload in the circuit supplied through the circuit-breaker 39, one or more of the overload coils 14 raise the corresponding armature or armatures 21 and lift the bridging contact 31 from the contact terminals 32. This compels the current in the circuit of the no-voltage coil 4C0 to pass through the heatin coil Ti the overload is but momentary, the overload coil or coils 14 soon drop the bridging contact 31 back upon the contact terminals 32, thus short-circuitin the heating coil 34 before it has produced a sufficient deflection of the thermostat to separate contacts 35 and 36. However, if the overload continues the heating coil 3% heats the thermostat strip on which it is wound andcauses such strip toexpand, eventually causing the separation oi the contacts 35 and 36 and interrupting the circuit of the no-voltage coil 40. This trips the circuit-breaker, interrupting the supply of current to the circuit on which the overload exists. The armatures 21 then drop, the bridging member 31 again engages the contact terminals 32;, and the thermostat 33 cools and returns to its normal position. The parts are then ready for the next operation in the manner already described. However, if the circuit-breaker 39 is reclosed before the thermostat has cooled sufficiently to cause the engagement of the contacts 35 and 36, the circuit of the novoltage coil is completed solely through the contacts 31 and 32; so that if the overload on the circuit supplied through such circuit breaker still exists, the resultant lifting of the bridging contact 31 from the contact terminals,32 will cause the immediate tripping of the circuitbreaker 39.

T have shown my invention as applied to a three-phase circuit. This is merely by way of example, as it is equally applicableto any other type of circuit, the number of overload coils 14 and their compartments corresponding to the nature of the work required. For standardization in manufacture, the device when used in two-phase work is made exactly as illustrated save that the overload magnet in the central compartment is either omitted entirely or left un connected.

Many modifications may be made in the precise arrangement shown and described, and I aim to cover all such modifications which do not involve a departure from the spirit and scope of my invention'as set forth in the following claims.

What I claim as new is:

1. In a polyphase protective device, the combination of a plurality of electromagnets, a casing of insulating material having a plurality of compartments, said electromagnets being located different compartments, and means within said casing and eX- tending into each coil containing compartment for mechanically connecting the armatures of said electromagnets.

2. ln a polyphase protective device, the combination of a plurality of electromagnets, each adapted to be connected in a ditterent phase of the circuit to be protected, an insulating casing having a plurality of compartments, said electromagnets being located in dilierent compartments, the armature of each electromagne'; being operative on the occurrence of abnormal conditions in the circuit of its coil, means within said casing and extending into each of said coil containing compartments for mechanically connecting all of said armatures, and a switch actuated by the movement of said connecting means, saidconnecting means being operative to actuate said switch on the occurrence oif abnormal conditions in any of the phases of the circuit to be protected.

3. ln a protective device for polyphase electric circuits, a casin divided into a plurality of compartments, electromagnets in certain of said compartments, means for connecting the armatures of said electromagnets, a switch associated with said connecting means whereby said switch may be operated on the actuation of the armature of any of said electromagnets, terminals for each electromagnet coilbeing brought through its compartment wall and into a separate compartment, and a second switch in circuit with the first switch and occupying a separate compartment.

4:. in a protective device for polyphase electric circuits, a casing, a plurality of electromagnets in said casing, each magnet being in the circuit or a separate phase and having an armature movable on the occurrence of predetermined conditions in the circuit of its magnet, a switch, means for causing the operation of said switch on the movement of any one of said armatures, a second switch in circuit with the first switch, the fixed contacts of "said switches being supported by the wall of said casing, and a second casing for inclosing parts of the second switch.

r 5. In a circuit protective device for polyphase electric circuits, a casing, a plurality of electromagnets in said casing, each of said magnets being in the circuit of a separate phase and having an armature movable on the occurrence of predetermined conditions in the circuit of its magnet, a switch, means for causing the operation of said switch on the movement of any one of saidarmatures, terminals for the windings of said electromagnets passing through a Wall of said casing and into a separate com pa-rtment, and a second switch in circuit with the first switch and occupying a separate compartment.

6. In a protective device for polyphase electric circuits, a casing, a plurality of electromagnets in said casing, each magnet being in the circuit of a separate phase and having an armature movable on the occurrence of predetermined conditions in the circuit of its magnet, a switch, means for causing the operation of said switch on the 

